Trey Gilliard is a mercenary but he doesn't kill people. What he does is hire himself out to explore and study extremely remote areas on the planet, to help protect the animals and environment. When he's in Africa, exploring a relatively untouched piece of jungle forest, he encounters some very strange wasps. And he soon learns that these extremely deadly wasps use mammals, including man, for their young's hosts. In fact, because the area where they've evolved is now being disrupted-and the natural environment that has kept them in check is being destroyed-they begin to expand their territory. Trey discovers this first, with the nearby villages, who have worked out "agreements" with these predators and when he's sent back to NYC realizes that they've started expanding all over the world, via smuggling themselves aboard ships and planes. By the time the authorities acknowledge the problem it's far too late. Trey and a group of people try to halt the takeover-and ultimately have to make a very specific decision for their-and mankind's-survival.
This was a fun book, as if Michael Crichton wrote THE SWARM. Every so often I get the itch to read a "killer animal" book and INVASIVE SPECIES hit the spot. Recommended.